JEE Mains · Physics · STD 12 - 3. current electricity
In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across \(52\ cm\) of the potentiometer wire. If the cell is shunted by a resistance of \( 5\,\Omega\), a balance is found when the cell is connected across \(40\ cm\) of the wire. Find the internal resistance of the cell ........... \(\Omega\)
- A \(1.5\)
- B \(2 \)
- C \(2.5 \)
- D \(1\)
Answer & Solution
Correct Answer
(A) \(1.5\)
Step-by-step Solution
Detailed explanation
Using formula, internal resistance, \(r=\left(\frac{l_{1}-l_{2}}{l_{2}}\right) s=\left(\frac{52-40}{40}\right) \times 5=1.5 \Omega\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- When Uranium is bombarded with neutrons, it undergoes fission. The fission reaction can be written as \({}_{92}{U^{235}} + {}_0{n^1} \to {}_{56}B{a^{141}} + {}_{36}K{r^{92}} + 3x + Q{\rm{( energy)}}\) where three particles named \(x\) are produced and energy \(Q\) is released. What is the name of the particle \(x\) ?JEE Mains 2013 Medium
- What is the minimum energy required to launch a satellite of mass \(m\) from the surface of a planet of mass \(M\) and radius \(R\) in a circular orbit at an altitude of \(2R\)?JEE Mains 2013 Medium
- An ideal gas at atmospheric pressure is adiabatically compressed so that its density becomes \(32\) times of its initial value. If the final pressure of gas is \(128\) atmosphers, the value of \(\gamma\) the gas isJEE Mains 2013 Medium
- A sample of a liquid is kept at 1 atm. It is compressed to 5 atm which leads to change of volume of \(0.8 \mathrm{~cm}^3\). If the bulk modulus of the liquid is 2 GPa , the initial volume of the liquid was _______ litre. \(\left(\right.\) Take \(\left.1 \mathrm{~atm}=10^5 \mathrm{~Pa}\right)\)JEE Mains 2025 Medium
- If the distance of the earth from Sun is \(1.5 \times 10^6\,km\). Then the distance of an imaginary planet from Sun, if its period of revolution is \(2.83\) years is \(.............\times 10^6\,km\)JEE Mains 2023 Medium
- For a rolling spherical shell, the ratio of rotational kinetic energy and total kinetic energy is \(\frac{x}{5}\). The value of \(x\) is ................JEE Mains 2023 Medium
More PYQs from JEE Mains
- A triangle is formed by \(X -\) axis, \(Y\) - axis and the line \(3 x+4 y=60\). Then the number of points \(P ( a, b)\) which lie strictly inside the triangle, where \(a\) is an integer and \(b\) is a multiple of \(a\), is \(...........\)JEE Mains 2023 Hard
- If \(\vec{a}\) is nonzero vector such that its projections on the vectors \(2 \hat{i}-\hat{j}+2 \hat{k}, \hat{i}+2 \hat{j}-2 \hat{k}\) and \(\hat{k}\) are equal, then a unit vector along \(\vec{a}\) is:JEE Mains 2025 Medium
- An effective power of a combination of \(5\) identical convex lenses which are kept in contact along the principal axis is \(25 \mathrm{D}\). Focal length of each of the convex lens is _______.JEE Mains 2024 Hard
- Let \(P (3,3)\) be a point on the hyperbola, \(\frac{x^{2}}{a^{2}}-\frac{y^{2}}{b^{2}}=1 .\) If the normal to it at \(P\) intersects the \(x\)-axis at \((9,0)\) and \(e\) is its eccentricity, then the ordered pair \(\left( a ^{2}, e ^{2}\right)\) is equal toJEE Mains 2020 Hard
- Let \(\lambda^{*}\) be the largest value of \(\lambda\) for which the function \(f _{\lambda}( x )=4 \lambda x ^{3}-36 \lambda x ^{2}+36 x +48\) is increasing for all \(x \in R\). Then \(f _{\lambda} *(1)+ f _{\lambda} *(-1)\) is equal toJEE Mains 2022 Hard
- The amplitude of a damped oscillator decreases to \(0.9\) times its original magnitude in \(5\ s\). In another \(10\ s\) it will decrease to \(\alpha \) times its original magnitude, where \(\alpha \) equalsJEE Mains 2013 Medium